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Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 2011 Acquisitions | Dec. 31, 2010 2011 Acquisitions | Dec. 31, 2010 2010 Acquisitions | Dec. 31, 2009 2010 Acquisitions | Dec. 31, 2012 2012 Acquisitions | Dec. 31, 2011 2012 Acquisitions
Business Acquisition, Pro Forma Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | $ 1,058,142 | $ 1,059,857 | $ 1,015,043 | $ 1,035,286 | $ 1,230,408 | $ 1,163,341
Income before income taxes |  |  |  | 283,404 | 291,944 | 278,635 | 274,908 | 315,051 | 313,706
Net income |  |  |  | $ 171,805 | $ 177,464 | $ 169,373 | $ 165,420 | $ 190,228 | $ 190,174
Net income per share: |  |  |  |  |  |  |  |  |
Basic |  |  |  | $ 1.20 | $ 1.25 | $ 1.19 | $ 1.17 | $ 1.33 | $ 1.33
Diluted |  |  |  | $ 1.19 | $ 1.23 | $ 1.18 | $ 1.16 | $ 1.30 | $ 1.31
Weighted average number of shares outstanding: |  |  |  |  |  |  |  |  |
Basic | 139,364 | 138,582 | 137,924 | 138,582 | 137,924 | 137,924 | 137,173 | 139,364 | 138,582
Diluted | 142,010 | 140,264 | 139,318 | 140,264 | 139,318 | 139,318 | 137,507 | 142,010 | 140,264

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